■1 



322 



BOTANICAL GAZETTE 



[APRIL 



The system can be isolated almost entirely from the atmosphere by 

 the protecting tubes and the water seals as shown in the diagram. The 

 principal advantages of the apparatus are that it requires little attention 



I. Feeding Siphon. 



2. Tube to adjust *ater level in 3 



3. Constant level. 



4. Retort with neck bent at 1 35° 



5. Water seal. 



6. Pledget of glass wool. 



7. Condenser. 



8. Adapter making water seal 



connection . 



9. Electric Flask Heater. 



10. Rubber connection. 

 I I. Rubber stopper. 



~ 



Fig. i 



- 













beyond occasional cleaning, and can be relied upon to produce a constant 

 supply of high resistance water containing only materials dissolved from 



% • m - m ■ m m m m 



slightly soluble glass. 

 culture, Washington, D.C. 



>/ 







